The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Congressional Districts are the 435 areas from which people are elected to the U.S. House of Representatives. After the apportionment of congressional seats among the States based on census population counts, each State is responsible for establishing congressional districts for the purpose of electing representatives. Each congressional district is to be as equal in population to all other congressional districts in a State as practicable. The congressional districts for the 111th Congress (January 2009 to 2011) continue to be based on Census 2000 data. The TIGER/Line shapefiles for the District of Columbia, Puerto Rico, and the Island Areas (American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands) each contain a single record for the non-voting delegate district in these areas. The boundaries of all other congressional districts are provided to the Census Bureau through the Redistricting Data Program (RDP).

Purpose:

In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line Shapefiles.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 201001

Ending_Date: 201007

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

TIGER/Line Shapefiles are extracted from the Census MAF/TIGER database. No changes or updates will be made to this version of the TIGER/Line Shapefiles. Future releases of TIGER/Line Shapefiles will reflect updates made to the Census MAF/TIGER database.

The TIGER/Line Shapefile products are not copyrighted however TIGER/Line and Census TIGER are registered trademarks of the U.S. Census Bureau. These products are free to use in a product or publication, however acknowledgement must be given to the U.S. Census Bureau as the source. The boundary information in the TIGER/Line Shapefiles are for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes does not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.Coordinates in the TIGER/Line shapefiles have six implied decimal places, but the positional accuracy of these coordinates is not as great as the six decimal places suggest.

Accurate against Federal Information Processing Standards (FIPS), FIPS Publication 6-4, and FIPS-55 at the 100% level for the codes and base names. The remaining attribute information has been examined but has not been fully tested for accuracy.

Logical_Consistency_Report:

The Census Bureau performed automated tests to ensure logical consistency and limits of shapefiles. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. All polygons are tested for closure. The Census Bureau uses its internally developed geographic update system to enhance and modify spatial and attribute data in the Census MAF/TIGER database. Standard geographic codes, such as FIPS codes for states, counties, municipalities, county subdivisions, places, American Indian/Alaska Native/Native Hawaiian areas, and congressional districts are used when encoding spatial entities. The Census Bureau performed spatial data tests for logical consistency of the codes during the compilation of the original Census MAF/TIGER database files. Most of the codes for geographic entities except states, counties, urban areas, Core Based Statistical Areas (CBSAs), American Indian Areas (AIAs), and congressional districts were provided to the Census Bureau by the USGS, the agency responsible for maintaining FIPS 55. Feature attribute information has been examined but has not been fully tested for consistency. For the TIGER/Line Shapefiles, the Point and Vector Object Count for the G-polygon SDTS Point and Vector Object Type reflects the number of records in the shapefile attribute table. For multi-polygon features, only one attribute record exists for each multi-polygon rather than one attribute record per individual G-polygon component of the multi-polygon feature. TIGER/Line Shapefile multi-polygons are an exception to the G-polygon object type classification. Therefore, when multi-polygons exist in a shapefile, the object count will be less than the actual number of G-polygons.

Completeness_Report:

Data completeness of the TIGER/Line Shapefiles reflects the contents of the Census MAF/TIGER database at the time the TIGER/Line Shapefiles were created.

TIGER/Line Shapefiles are extracted from the Census MAF/TIGER database by nation, state, county, and entity. Census MAF/TIGER data for all of the aforementioned geographic entities are then distributed among the shapefiles each containing attributes for line, polygon, or landmark geographic data.

North American Datum of 1983 in the 48 contiguous states, the District of Columbia, Alaska, Hawaii (only Oahu Island within Honolulu County, HI (15003)), Puerto Rico, and the U.S. Virgin Islands. Regional datums are used in the Pacific Island Areas (American Samoa, Guam, and the Commonwealth of the Northern Mariana Islands) and most of Hawaii. The datums used in the remainder of Hawaii are as follows: Hawaii County, HI (15001), Old Hawaiian Datum; Honolulu County, HI (15003), local astronomic datums for all islands northwest of 161 degrees west longitude; Kalawao County, HI (15005), Old Hawaiian Datum; Kauai County, HI (15007), Old Hawaiian Datum for Kauai Island and local astronomic datum for Kaula Rock; Maui County, HI (15009), Old Hawaiian Datum. The datums used in American Samoa are as follows: Eastern District, AS (60010), American Samoa Datum of 1962; Manu'a District, AS (60020), American Samoa Datum of 1962; Rose Island, AS (60030), local astronomic datum; Swains Island, AS (60040), local astronomic datum 1939; Western District, AS (60050), American Samoa Datum of 1962. The Guam Datum of 1963 is used in Guam (66010). The datums used in the Commonwealth of the Northern Mariana Islands are as follows: Northern Islands Municipality (69085), Guam Datum of 1963 (Agrihan, Alamagan, Anatahan, Gugan, Medinilla, Pagan, and Sarigan Islands) and local astronomic datums (Asuncion, Maug, and Farallon De Pajaros Islands); Rota Municipality (69100), Guam Datum of 1963; Saipan Municipality (69110), Guam Datum of 1963; Tinian Municipality (69120), Guam Datum of 1963.

Ellipsoid_Name:

Geodetic Reference System 80 where the datum is the North American Datum of 1983.

Enumerated_Domain_Value_Definition: Congressional District (in states with more than one district)

Enumerated_Domain_Value_Definition_Source: U.S. Census Bureau

Enumerated_Domain:

Enumerated_Domain_Value: 98

Enumerated_Domain_Value_Definition: Non-Voting Delegate

Enumerated_Domain_Value_Definition_Source: U.S. Census Bureau

Enumerated_Domain:

Enumerated_Domain_Value: 99

Enumerated_Domain_Value_Definition: No Representation

Enumerated_Domain_Value_Definition_Source: U.S. Census Bureau

Attribute:

Attribute_Label: GEOID10

Attribute_Definition:

111th congressional district identifier, a concatenation of state Federal Information Processing Standards (FIPS) code and the 111th congressional district FIPS code

Attribute_Definition_Source: U.S. Census Bureau

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name:

INCITS.38-200x (R2004), Codes for the Identification of the States, the District of Columbia, Puerto Rico, and the Insular Areas of the United States (Formerly FIPS 5-2) and the current congressional district code that appears in CD111FP

Codeset_Source: U.S. Census Bureau

Attribute:

Attribute_Label: NAMELSAD10

Attribute_Definition:

2010 Census name and the translated legal/statistical area description for congressional district code

Attribute_Definition_Source: U.S. Census Bureau

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name:

Use values from the congressional district code (CDFP) field, where value is 01 to 52 without leading zeros and/or the translated legal/statistical area description code for congressional district that appears in LSAD10

Codeset_Source: U.S. Census Bureau

Attribute:

Attribute_Label: LSAD10

Attribute_Definition:

2010 Census legal/statistical area description code for congressional district

No warranty, expressed or implied is made with regard to the accuracy of these data, and no liability is assumed by the U.S. Government in general or the U.S. Census Bureau in specific as to the spatial or attribute accuracy of the data. The act of distribution shall not constitute any such warranty and no responsibility is assumed by the U.S. government in the use of these files. The boundary information in the TIGER/Line Shapefiles is for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes do not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.

The TIGER/Line shapefiles contain geographic data only and do not include display mapping software or statistical data. For information on how to use the TIGER/Line shapefile data with specific software package users shall contact the company that produced the software.